JPH0745428A - Polar electromagnet device - Google Patents

Abstract

PURPOSE:To provide a polar electromagnet device which reduces power consumption and moreover improves certainty of reset operation. CONSTITUTION:A small diameter part 4b having a prescribed length is provided on the other end part 4b of a plunger 4 which is arranged inside a coil in the state allowing reciprocating motion and whose one end part is opposite to coupling piece of a yoke 2 and the other part 4b is projected from the tips of both side pieces of the yoke, and an engaging part engaging loose with the small diameter part on a base end of a reset member 8 whose base end 8a is linked with a plunger in order to transmit the external force to the plunger at the time of receiving the external force for returning the plunger to a position to be attracted by the coupling piece. Then, this reset member 8 is supported by the other end part 4b of the plunger 4 so as to allow shifting by a prescribed amount in the direction of a reciprocal movement of the plunger 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polar electromagnet device suitable for an abnormal current detection device of a circuit breaker.

[0002]

2. Description of the Related Art An abnormal current detecting device for a circuit breaker using a polar electromagnet device is shown in FIG. 11, and a polar electromagnet device is shown in FIGS. 13 to 16.

The polar electromagnet device 1 includes a yoke 2 having a U-shaped cross section with both side pieces 2a, 2a and a connecting piece 2b, and a cylindrical coil frame 3a arranged inside the both side pieces 2a, 2a. Coil wound on
3, the coil frame 3a is arranged in a reciprocally movable manner, one end 4a faces the connecting piece 2b, more specifically, the fixed iron core 2c fixed to the connecting piece 2b, and the other end 4b is Plunger 4 protruding from the tips of both side pieces 2a, 2a and plunger 4 when no current is flowing in coil 3 Connecting piece 2b (fixed iron core 2c)
In order to draw the magnetic flux φ1 to both side pieces 2a, 2a, connecting piece 2b, fixed iron core 2c and plunger 4, a permanent magnet 5 is arranged between both side pieces 2a, 2a together with a spacer 5a made of a magnetic material.
And when a current flows to the coil 3 to generate a magnetic flux φ2 in a direction that cancels the magnetic flux φ1 of the permanent magnet 5, and thus the magnetic attraction force is weakened by the magnetic flux φ2, the plunger 4 is connected to the connecting piece 2b (fixed iron core). 2c) The spring 7 that urges the plunger 4 to separate it from the
It has a reset member 8 whose base end 8a is linked to the other end 4b of the plunger 4 so as to transmit the external force to the plunger 4 when the external force for returning to the position where it is attracted to the (fixed iron core 2c) is received.

The other end 4b of the plunger 4 is a large-diameter collar 4c. Then, in the reset member 8, the base end 8a becomes a U groove having a diameter smaller than that of the flange portion 4c, and the reset member 8 is loosely engaged with the plunger 4.
It is pressed against the collar 4c by the spring 7. Therefore,
The linkage between the base end 8a of the reset member 8 and the other end 4b of the plunger 4 has a relationship including the spring 7 and a magnetic attraction force.

Such an electromagnet device 1 and a reset member 8
The former is fixedly attached to the frame 11, and the latter is movably supported as a trip member of the circuit breaker. The reset member 8, that is, the trip member has a reset piece 8c, and the other end 8b drives the trip link 12 by pressing. Further, the trip link 12 presses and drives a latch link 13 which constitutes a part of a general opening mechanism.

The handle 14 drives a movable contactor block (not shown) to turn on and off both fixed and movable contacts, and resets the contact opening mechanism portion after the trip.
That is, the handle 14 uses the base end portion 14a as a fulcrum of rotation, and the operation portion 14b on the distal end side can rotate between the ON position and the OFF position, and when the operation portion 14b is rotated to the ON position or the OFF position. , The movable contact block is driven through the opening mechanism to turn both the fixed and movable contacts ON or OFF. When the handle 14 is in the ON position and trips, the handle 14 is rotated to an intermediate position between the ON position and the OFF position. Further, the handle 14 resets the electromagnet device 1 together with the opening mechanism part after the trip, and pushes the reset piece 8c of the reset member (trip member) 8 near the middle of the base end part 14a and the operation part 14b. It has a pressing portion 14c.

Further, the circuit breaker includes a sensor (not shown) for detecting an overcurrent, a short-circuit current or a leakage current,
Judge the state to trip based on the output of the sensor,
The coil 3 is provided with a judgment circuit that supplies a current for trip operation.

The operation of these electromagnet device 1, reset member (trip member) 8 and handle 14 is schematically shown as follows.
It becomes like (a) to (d) of FIG. Also, (a) through
The operation of the electromagnet device 1 corresponding to (d) is shown in FIGS.
It becomes like 6. In (a) and Fig. 13, the circuit breaker is ON.
The coil 3 is in a state and no current is flowing through the coil 3. In this case, the magnetic flux φ1 due to the permanent magnet 5 flows, and the one end 4a of the plunger 4 is attracted to the fixed iron core 2c.

(B) and FIG. 14 show a trip state,
The current for tripping flows through the coil 3, and the magnetic flux φ2 that flows therethrough cancels the force that attracts the plunger 4,
Therefore, the spring force of the spring 7 causes the plunger 4 to project outward. The reset member (trip member) 8 responds to the operation of the plunger 4, and accordingly the trip link 12 and the latch link 13 also respond to open the circuit breaker. Further, the handle 14 is also moved to the trip position and is maintained in that state even when the current for trip operation stops flowing.

(C) and FIG. 15 show the reset operation, in which the handle 14 is moved from the reset position to the OFF position. As a result, the contact opening mechanism is reset and the reset pressing portion 14c of the handle 14 is reset by the reset member.
The reset piece 8c of the (trip member) 8 is pressed, the spring 7 is compressed, and the spring force is not applied to the plunger 4. Therefore, the plunger 4 is attracted to the fixed iron core 2c by the magnetic flux φ1 of the permanent magnet 5, and the electromagnet device 1 is also reset.

(D) and FIG. 16 show the OFF state. That is, when the circuit breaker of this kind is reset to the ON state after the trip, the handle 14 is once returned to the OFF position and then returned to the ON position.

In FIG. 11, reference numeral 15 is an ON / OFF detection switch which responds to the movable contact block, and 16 is a plunger.
Trip detection switch that responds to 4, 17 is ON and OFF
Link, 18 is a trip link.

[0013]

In the above-mentioned polarized electromagnet device, it is desirable to increase the operation stroke of the plunger 4 for reliable operation when it is used in a circuit breaker, and the polarized electromagnet device is consumed. It is also desired to reduce the power. Increasing the operating stroke of the plunger 4 means increasing the gap between the plunger 4 and the fixed core 2c when a trip occurs. Then, when resetting next, the magnetic flux φ1 due to the permanent magnet 5
The magnetic resistance of the magnetic path in which the current flows increases, and the certainty of the reset (suction to the fixed iron core 2c) operation of the plunger 4 decreases.

Further, in order to reduce the power consumption of the polarized electromagnet device, as shown in FIGS.
In some cases, a magnetic body 6 is attached to form a magnetic path through which the magnetic flux φ2 flows without passing through the permanent magnet 5 when a current flows in a direction to cancel the magnetic flux of the permanent magnet 5. Specifically, the magnetic body 6 has a flat plate shape with a through hole in the center, and has a coil frame.
It is arranged between the outer end of 3a and the permanent magnets 5, 5 and the spacer 5a.

In this state, in the ON state shown in FIG. 17, the magnetic flux φ1 generated by the permanent magnet 5 is the permanent magnet 5 →
2a, 2a → Connecting piece 2b → Fixed iron core 2c → Plunger 4 → Permanent magnet 5 magnetic path and permanent magnet 5 → Both sides 2a, 2a → Magnetic body 6
→ Plunger 4 → Flows in the magnetic path of permanent magnet 5 and attracts plunger 4 to connecting piece 2b (fixed iron core 2c). In this state, when a current for trip operation flows through the coil 3, as shown in FIG. 18, a magnetic flux φ2 due to it flows to cancel the force of attracting the plunger 4, and the plunger 4 is moved by the spring force of the spring 7. Although protruding outward, the magnetic flux φ2 flows through the magnetic body 6 without passing through the permanent magnet 5. Therefore, the magnetic resistance of the magnetic path is small and the current for trip operation may be small.

By the way, when the operation stroke of the plunger 4 is increased in the magnetic body 6 having such a magnetic body 6, the reset member (trip member) 8 compresses the spring 7 during the reset operation shown in FIG. When is not applied to the plunger 4, it is difficult for the plunger 4 to be reliably attracted to the fixed iron core 2c by the magnetic flux φ1 of the permanent magnet 5. That is, the magnetic flux φ1 flows more in the magnetic body 6 than in the plunger 4 and the fixed iron core 2c due to the magnitude of the magnetic resistance. In other words, reset of plunger 4 (suction to fixed iron core 2c)
The certainty of is greatly reduced.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a polarized electromagnet device which reduces power consumption and improves reliability of reset operation.

[0018]

In order to solve such a problem, a polar electromagnet device according to claim 1 has a yoke having a U-shaped cross section with both side pieces and a connecting piece, and an inner side of each side piece. A cylindrical coil that is arranged, a plunger that is arranged in a reciprocable manner inside the coil and has one end facing the connecting piece and the other end protruding from the tips of both side pieces, and the coil The current in the direction that cancels the magnetic flux of the permanent magnet in the coil, and the permanent magnets arranged between the both sides so that the magnetic flux flows through the coupling piece and the plunger to attract the plunger to the coupling piece when no current is flowing. Spring biases the plunger to move the plunger away from the connecting piece when it flows, and the base end works to transmit it to the plunger when it receives an external force to return the plunger to the position where it is attracted by the connecting piece. Lycee working together In the polarized electromagnet apparatus having a spring member, the reset member is provided at the other end of the plunger so that the base end of the reset member receives the biasing force of the spring and is movable by a predetermined amount in the reciprocating direction of the plunger. It is configured to be supported.

The polarized electromagnet device according to claim 2 is
According to a first aspect of the present invention, when a current flows in the coil in a direction of canceling the magnetic flux of the permanent magnet, a magnetic body that forms a magnetic path through which the magnetic flux flows without passing through the permanent magnet is attached.

The polarized electromagnet device according to claim 3 is
A small-diameter portion having a predetermined length is provided at the other end of the plunger according to claim 1 or 2, and an engaging portion that loosely fits the small-diameter portion is provided at the base end of the reset member.

The polarized electromagnet device according to claim 4 is
A large-diameter flange part is provided at the other end of the plunger according to claim 1 or 2, an engagement part having a smaller diameter than the flange part is provided at the base end of the reset member, and the flange part is sandwiched together with the engagement part. The pressing portion is arranged in parallel with the engaging portion at a predetermined interval.

Further, in the polarized electromagnet device according to claim 5, the reset member according to any one of claims 1 to 4 is also used as a trip member of the circuit breaker.

[0023]

According to the structure described in claim 1, when the plunger is reset, when the gap between the plunger and the connecting piece of the yoke (specifically, the fixed iron core) is large and the magnetic attraction force is extremely small, an external force is applied. As a result, the plunger is forcibly pressed by a certain amount, and when the gap becomes smaller and the magnetic attraction force increases, the magnetic attraction force again attracts the plunger, and as a result, the plunger can be reliably reset.

According to the second aspect of the invention, the effect of the first aspect can be obtained even in the case where the magnetic body is attached, and the power consumption of the coil can be reduced.

Further, according to the constitution of claim 3 or 4, a concrete constitution which achieves the action of claim 1 or 2 can be obtained.

Further, according to the structure of the fifth aspect, it is possible to realize the circuit breaker having the effects of the first to fourth aspects.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention used in a circuit breaker will be described below with reference to FIGS. The essential part of the present invention is the linked configuration of the plunger and the reset member. The members having the same basic functions as those of the conventional example are denoted by the same reference numerals as those of the conventional example.

The polarized electromagnet device 1 includes a yoke 2, a coil 3, a permanent magnet 5 and a magnetic material similar to those described in the conventional example.
6 and spring 7. That is, the yoke 2 has two side pieces 2a, 2
A and the connecting piece 2b form a U-shaped cross section, and the coil 3 is
It is wound around a tubular coil frame 3a arranged inside 2a, 2a.

The plunger 4 is disposed inside the coil 3, more specifically, the coil frame 3a in a reciprocally movable manner, and has one end
4a is a connecting piece 2b, more specifically, a fixed core fixed to the connecting piece 2b
The other end 4b facing the 2c and having the large-diameter collar 4c has both side pieces 2
Although it is similar to the conventional one in that it protrudes from the tips of a and 2a, a small diameter portion 4d having a predetermined axial length from the inner end surface of the collar portion 4c is formed at the other end portion 4b.

Further, the permanent magnets 5, 5 are provided at both ends of the spacer 5a made of a magnetic material and are arranged between the tips of both side pieces 2a, 2a of the yoke 2, and the magnetic body 6 has a through hole in the center. It has a flat plate shape and is arranged between the outer end of the coil frame 3a and the permanent magnets 5, 5 and the spacer 5a. A relatively small gap l2 is interposed between both end surfaces of the magnetic body 6 and both side pieces 2a, 2a of the yoke 2.

In this embodiment, the reset member 8 is used as a trip member of a circuit breaker, and the base end 8a serves as a U groove which is loosely engaged with the small diameter portion 4d of the plunger 4, and the spring 7 having a compression coil shape. While being pressed against the collar 4c, it is linked to the other end 4b of the plunger 4. Therefore,
The spring 7 urges the plunger 4 to separate the plunger 4 from the connecting piece 2b (fixed iron core 2c). In addition, the reset member 8 connects the plunger 4 to the connecting piece 2b (fixed iron core 2
When an external force for returning to the position attracted by c) is received from the handle described later, it will be transmitted to the plunger 4. The base end 8a of the reset member 8 receives the biasing force of the spring 7 and is movable by a predetermined amount in the reciprocating direction of the plunger 4.

Such an electromagnet device 1 and a reset member 8
As in the conventional example, the former is fixedly attached to the frame 11, and the latter is movably supported as a trip member of the circuit breaker. The reset member 8, that is, the trip member has a reset piece 8c, and the other end 8b drives the trip link 12 by pressing. Also, trip link 12
Is a latch link that forms part of the general opening mechanism.
Press 13 to drive.

Similarly to the conventional example, the handle 14 also drives a movable contactor block (not shown) to turn on and off both fixed movable contacts, and resets the contact opening mechanism portion after a trip. That is, the handle 14 uses the base end portion 14a as a fulcrum of rotation, and the operation portion 14b on the tip end side is in the ON position and the OFF position
It is possible to rotate between positions, and when the operation part 14b is rotated to the ON position or the OFF position, the movable contact block is driven through the opening mechanism part to turn the fixed movable both contacts ON or OFF.
Excuse me. When the handle 14 is in the ON position and trips, the handle 14 is rotated to an intermediate position between the ON position and the OFF position. Further, the handle 14 resets the electromagnet device 1 together with the opening mechanism part after the trip, and pushes the reset piece 8c of the reset member (trip member) 8 near the middle of the base end part 14a and the operation part 14b. Pressing part 14
has c.

The circuit breaker includes a sensor (not shown) for detecting overcurrent, short-circuit current or leakage current,
Judge the state to trip based on the output of the sensor,
The coil 3 is provided with a judgment circuit that supplies a current for trip operation.

Such a polarized electromagnet device 1 is shown in FIGS.
It operates as shown in. In FIG. 2, the circuit breaker is in the ON state, and no current is flowing in the coil 3.
In this case, the magnetic flux φ1 generated by the permanent magnet 5 is
Side pieces 2a, 2a → Connecting piece 2b → Fixed core 2c → Plunger 4 →
Spacer 5a → Magnetic path of permanent magnet 5 and permanent magnet 5 → Both sides 2a, 2a → Magnetic body 6 → Plunger 4 → Spacer 5a → Flow to magnetic path of permanent magnet 5 and one end 4a of plunger 4 is fixed core 2c. Have been sucked into. In this case, the plunger 4
The distance l1 between one end 4a of the and the fixed iron core 2c of the yoke 2 is the distance l2
If it is smaller, more magnetic flux flows in the former magnetic path. Further, the axial length of the small diameter portion 4d of the plunger 4 is such that the base end 8a of the reset member 8 is in the reciprocating direction of the plunger 4 (axial direction).
It is formed to be movable by a distance l3. Further, the spring force of the spring 7 is set so as not to overcome the magnetic attraction force when the distance l1 between the one end portion 4a of the plunger 4 and the fixed iron core 2c of the yoke 2 is smaller than a certain value.

FIG. 3 shows a trip state, which is a state after the trip operation current flows through the coil 3 in the state of FIG. That is, the magnetic flux φ2 due to the current for trip operation flows through the plunger 4, the fixed iron core 2c, the connecting piece 2b, the both side pieces 2a and 2a, the magnetic body 6, the plunger 4, and the plunger 4.
The forces attracting 4 are offset, so that the spring force of spring 7 overcomes the magnetic attraction and the plunger 4 projects outwards. The reset member (trip member) 8 responds to the operation of the plunger 4, and accordingly, the trip link 12 and the latch link 12
13 also responds and the circuit breaker is opened. Further, the handle 14 is also moved to the trip position and is maintained in that state even when the current for trip operation stops flowing. In this case, the distance l5 between the one end 4a of the plunger 4 and the fixed iron core 2c of the yoke 2 is the maximum.

FIG. 4 shows the reset operation, in which the handle 14 is moved from the reset position to the OFF position. As a result, the contact opening mechanism is reset, and the reset pressing portion 14c of the handle 14 presses the reset piece 8c of the reset member (trip member) 8. In this case, the reset member 8 moves by the distance l3 described above prior to the operation of the plunger 4, and then pushes the end face of the small diameter portion 4d to move the plunger 4. That is, in this state, since the distance l5 is much larger than the distance l2, most of the magnetic flux φ1 due to the permanent magnet 5 is, as shown in FIG.
Side pieces 2a, 2a → Magnetic body 6 → Plunger 4 → Spacer 5a →
It flows in the magnetic path of the permanent magnet 5, and there is almost no magnetic attraction force for resetting the plunger 4. The distance between the one end 4a of the plunger 4 and the fixed core 2c of the yoke 2 is l4.
(Permanent magnet 5 greater than load of plunger 4 x force of 9.8)
Magnetic flux φ1), the plunger 4 is fixed by the magnetic attraction force.
2c is sucked and reset.

As is clear from such an operation, the predetermined amount in which the plunger 4 can move in the reciprocating direction is a value capable of absorbing variations in the operating position of the handle 14.
That is, the axial length of the small diameter portion 4d of the plunger 4 is determined by the sum of the thickness of the reset member 8 and the variation in the operating position of the handle 14. The pressing of the reset member 8 of the handle 14 is preferably set to end immediately after reaching the above-mentioned distance l4.

FIG. 5 shows the OFF state. That is, when the circuit breaker is reset after tripping to be in the ON state, the handle 14 is once set to the OFF position and then returned to the ON position.

In FIG. 1, reference numeral 15 is an ON / OFF detection switch that responds to the movable contact block, and 16 is a plunger 4
Is a trip detection switch, 17 is an ON / OFF link, and 18 is a trip link.

Next, a second embodiment of the present invention will be described with reference to FIGS.
A description will be given based on 0. Also in this example, only the plunger 4 and the reset member 8 are different from the previous embodiment, and the other members are the same, so only these two members will be described.

The plunger 4 does not have the small diameter portion of the first embodiment, but has only the large diameter flange portion 4c at the other end portion 4b. Further, the reset member 8 is provided at its base end 8a with an engaging portion (for example, a U groove or a through hole which is loosely engaged with the plunger 4) having a diameter smaller than that of the collar portion 4c and movable with respect to the plunger 4.
In addition, a pressing portion 8d, which is located in parallel with the engaging portion at a predetermined interval, is continuously provided so as to sandwich the collar portion 4c together with the engaging portion.
This predetermined interval is substantially the same as the axial length of the small diameter portion of the first embodiment, and the thickness of the reset member 8 and the handle 14
It is determined by the sum of the variations in the operating positions of. Therefore, the base end 8a of the reset member 8 can be moved by the distance l3 in the reciprocating direction (axial direction) of the plunger 4, as in the first embodiment. The operation of this device is the same as that of the first embodiment, and therefore its explanation is omitted.

Although each of the above-described embodiments has been described as being applied to a circuit breaker, the present invention is not limited to this.

[0044]

In the polarized electromagnet device according to the first aspect of the present invention, when the plunger is reset, when the gap between the plunger and the yoke connecting piece (specifically, the fixed iron core) is large and the magnetic attraction force is extremely small. , The plunger is forcibly pressed by an external force, and when the gap becomes smaller and the magnetic attraction increases, the magnetic attraction again attracts the plunger, and as a result, the plunger can be reliably reset. .

The polarized electromagnet device according to a second aspect of the invention has the same effects as those of the first aspect of the invention, and the magnetic resistance of the magnetic path through which the magnetic flux for the trip operation flows is reduced, so that the trip operation is performed. Current, that is, power consumption of the coil can be reduced.

The polarized electromagnet device according to claim 3 or 4 comprises:
It is possible to realize a preferable specific configuration that can obtain the effects of the first and second aspects.

The polarized electromagnet device according to the fifth aspect can realize a circuit breaker having the effects of the first to fourth aspects.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an ON state for explaining the operation.

FIG. 3 is an explanatory diagram illustrating a trip state for explaining the operation.

FIG. 4 is an explanatory diagram illustrating a reset state for explaining the operation.

FIG. 5 is an explanatory diagram showing an OFF state for explaining the operation.

FIG. 6 is a perspective view showing a second embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an ON state for explaining the operation.

FIG. 8 is an explanatory diagram showing a trip state for explaining the operation.

FIG. 9 is an explanatory diagram illustrating a reset state for explaining the operation.

FIG. 10 is an explanatory diagram showing an OFF state for explaining the operation.

FIG. 11 is a perspective view showing a conventional example.

12A to 12D are schematic diagrams for explaining the operation of the circuit breaker.

FIG. 13 is an explanatory diagram showing an ON state for explaining the operation.

FIG. 14 is an explanatory diagram showing a trip state for explaining the operation.

FIG. 15 is an explanatory diagram showing a reset state for explaining the operation.

FIG. 16 is an explanatory diagram showing an OFF state for explaining the operation.

FIG. 17 is an explanatory diagram showing an ON state for explaining the operation of another conventional example.

FIG. 18 is an explanatory diagram showing a trip state for explaining the operation.

FIG. 19 is an explanatory diagram showing a reset state for explaining the operation.

[Explanation of symbols]

 1 polarized electromagnet device 2 yoke 3 coil 4 plunger 4a one end of plunger 4b other end of plunger 4c flange of plunger 4d small diameter part of plunger 5 permanent magnet 6 magnetic body 7 spring 8 reset member (trip member) 8a reset member Base end 8b of the reset member 8c reset piece of the reset member 8d reset member pressing part

Claims (5)

[Claims] 1. A yoke having a U-shaped cross section formed by both side pieces and a connecting piece, and a cylindrical coil disposed inside the both side pieces.
A plunger with one end facing the connecting piece and the other end protruding from the tips of both sides of the coil, arranged so that it can reciprocate inside the coil, and the plunger connecting piece when no current is flowing through the coil. A permanent magnet arranged between the both side pieces so that a magnetic flux flows through the both side pieces, the connecting piece and the plunger to be attracted to
When a current flows in the coil in a direction that cancels the magnetic flux of the permanent magnet, a spring that urges the plunger to separate it from the connecting piece and an external force that returns the plunger to the position where it is attracted to the connecting piece A reset member having a base end linked to the plunger to transmit the force to the plunger, and the reset member has a base end that receives the biasing force of the spring and a reciprocating direction of the plunger. A polar electromagnet device supported by the other end of the plunger so as to be movable by a predetermined amount. 2. The polarized electromagnet according to claim 1, further comprising a magnetic body that forms a magnetic path through which the magnetic flux flows without passing through the permanent magnet when a current flows in the coil in a direction of canceling the magnetic flux of the permanent magnet. apparatus. 3. The polarized electromagnet according to claim 1, wherein a small-diameter portion having a predetermined length is provided at the other end of the plunger, and an engaging portion which is loosely engaged with the small-diameter portion is provided at the base end of the reset member. apparatus. 4. A large-diameter flange portion is provided at the other end of the plunger, an engaging portion having a diameter smaller than that of the flange portion is provided at the base end of the reset member, and the engaging portion and the engaging portion sandwich the flange portion. 3. The polarized electromagnet device according to claim 1, further comprising a pressing portion that is arranged in parallel with the joining portion at a predetermined interval. 5. The polarized electromagnet device according to claim 1, wherein the reset member is also used as a trip member of a circuit breaker.